re-declare deprecated function html_li_default()

fix missing return

media: Fix media_resize_image cache check

The check was backwards, and it also caused a failure when there is no
cache file (mtime=0) because the function would still return the path to
the nonexist

media: Fix media_resize_image cache check

The check was backwards, and it also caused a failure when there is no
cache file (mtime=0) because the function would still return the path to
the nonexistent cache file.

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consistent html_buildlist() usage

see usage of html_buildlist in plugin acl (admin and action component)

re-declare deprecated functions for backward compatibility

`dbg_deprecated()` is called in `html_diff_head()`, `html_diff_navigation()`, `html_diff_navigationlink()`, and following functions:

* `h

re-declare deprecated functions for backward compatibility

`dbg_deprecated()` is called in `html_diff_head()`, `html_diff_navigation()`, `html_diff_navigationlink()`, and following functions:

* `html_denied()` is not used any plugins, but added fallback just in case.
* `html_locked()` is used by one third-party plugin (AjaxEdit), fallback should be added.
* `html_insert_softbreaks()` is used by one third-party plugin (TOS, terms of service), fallback should be added.

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Update translation

選擇 =>Traditional Chinese
选择 => Simplified Chinese

translation update

don't crush tables too narrow. fixes #3250

This ensures that the table wrapper has at least 50% of the page width
available. This allows small tables still be besides floating elements
like images o

don't crush tables too narrow. fixes #3250

This ensures that the table wrapper has at least 50% of the page width
available. This allows small tables still be besides floating elements
like images or the TOC, but larger tables will get the full width.

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add dbg_deprecated() calls

use Slika for image resizing and cropping

This replaces our own resize/crop function by the Slika library.

This is not yet ideal, as there is quite a bit duplicated code between
media_resize and me

use Slika for image resizing and cropping

This replaces our own resize/crop function by the Slika library.

This is not yet ideal, as there is quite a bit duplicated code between
media_resize and media_crop now. Ideally these two should be replaced by
a single method handling both. I'm just not sure where to best put it
yet.

Using Slika introduces two new features:

* auto rotation based on EXIF #3059
* support for webp #3238

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added Slika as dependency

translation update

typos

remove unused variable

add addToGroup and removeFromGroup

initial usermanager cli

change event naming scheme

FORM_*_OUTPUT scheme had been introduced since Apriil 2018, see #2286

Thorough tests for EO, DE, PT and ES

Correction for German collation; examples for German and Spanish; much better comments

fix Scrutinizer annotations

fix Scrutinizer annotations

fix missing or unnecessary use Event statements

register HTMLFORM_LOGIN_OUTPUT event handler

tigger HTMLFORM_*_OUTPUT events

trigger events in Form::toHTML() instead of using Event::createAndTrigger()

Form::toHTML() can trigger event

New event naming scheme HTMLFORM_*_OUTPUT should be tiggered to prevent break of old third-party plugins using old events HTML_*FORM_OUTPUT.

translation update